#include "LKH.h"
#include "Segment.h"

GainType Penalty_PDTSP() {
  static Node* StartRoute = 0;
  Node *N, *NextN, *M, *CurrentRoute;
  ;
  GainType P = 0;
  int Forward = SUCC(Depot)->Id != Depot->Id + DimensionSaved;
  int Pickups = 0, Deliveries = 0;

  if (!StartRoute) StartRoute = Depot;
  if (StartRoute->Id > DimensionSaved) StartRoute -= DimensionSaved;
  N = StartRoute;
  do {
    CurrentRoute = N;
    Serial++;
    do {
      if (N->Id <= Dim && N != Depot) {
        if (N->Pickup) {
          if (++Deliveries > Pickups || NodeSet[N->Pickup].Serial != Serial) P++;
        } else if (N->Delivery) {
          N->Serial = Serial;
          if (++Pickups == 1) {
            M = N;
            while (M != Depot) {
              if (M->Pickup) M->Serial = Serial;
              M = Forward ? SUCC(M) : PREDD(M);
            }
          }
          if (NodeSet[N->Delivery].Serial != Serial) P++;
        }
      }
      if (P > CurrentPenalty || (P == CurrentPenalty && CurrentGain <= 0)) {
        StartRoute = CurrentRoute;
        return CurrentPenalty + (CurrentGain > 0);
      }
      NextN = Forward ? SUCC(N) : PREDD(N);
      N = Forward ? SUCC(NextN) : PREDD(NextN);
    } while (N->DepotId == 0);
  } while (N != StartRoute);
  return P;
}
